Micromagnetic Configuration of Variable Nanostructured Cobalt Ferrite: Modulating and Simulations towards Memory Devices.

Author(s) Zhang, J.; Zhu, S.; Xia, W.; Ming, J.; Li, F.S.; Fu, J.
Journal ACS Appl Mater Interfaces
Date Published 2019 Jul 16

Magnetic nanostructures with flux-closure state or single domain state have a widespread application in diverse memory devices. However, an insight into the modulation of these variable states within one specific magnetic material is rarely reported but still needed. Herein, these micromagnetic configurations within prototypical cobalt ferrite (CoFeO) nanostructures in different size and dimension were studied by modulating the assembly of CoFeO building blocks. We find that the CoFeO nanowire (NW) has a multi-domain structure when the diameter is about 90 nm, in which the domain walls (DWs) locate preferentially at the grain boundary and can convert to single-domain state when the diameter is reduced. Alternatively, a flux closure domain state is obtained when the CoFeO nanostructure changing from NW to nanosheet (NS), where the DWs location depends on the overall shape of NS. In addition, we further confirm that the magnetic anisotropy and magnetostatic energy are two main factors affecting the micromagnetic configuration in CoFeO nanostructures by crystallographic analysis and micromagnetic simulations. Our experimental and simulation results demonstrate that the modulation of morphology and dimension are efficient to tailor the micromagnetic configuration in magnetic nanostructures.

DOI 10.1021/acsami.9b07502
ISSN 1944-8252
Citation ACS Appl Mater Interfaces. 2019.

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